Drop-press pulley



(No Model.)

F. MOSSBERG. DROP PRESS PULLEY.

Patented Aug. 8, 1893.

UNITED STATES lPATENT Genies.

FRANK. MOSSBERG, oF ATTLEBoRoUe H', MASSACHUSETTS.

DROP-PRESS PULLEY.-

SPECIFICATION formingpart of Letters Patent No. 502,93, dated August 8, 1893.

Application filed May 3l, 1893.

To all whom t may concern:

Be it known that I, FRANK MOSSBERG, of Attleborough,'in the county of Bristol and lowing is a full, clear, and exact description thereof, reference being had to the accompanylug drawings, and to the letters of reference marked thereonfwhich form a part YofY this specication.

This invention relates to the pulleys used in drop presses,to raise the drop and die when the press is operated by other power than manual strength. It is illustrated in the acl companying drawings.

Figure l, is a side elevation of a droppress with the improved pulley represented in vertical section, taken Von line y y, in Fig. 2. Fig. 2, is a front elevation of the counter shaft and driving pulleys, and the press pulley. Fig. 3, is a vertical section ofthe press pulley, taken through the center of the pulley, on line z c, in Fig. 4, with the shaft in eleva-A tion. Fig. 4, shows a side elevation of the inner hub of the inner flange plate, and ange plate on it. Fig. 5, is a side elevation of a ring of sections that are held in a groove in the periphery of the flange plate of Fig. 4. Fig. 6, is a vertical cross section of the ring shown in Fig. 5, on linesbcfxz. Fig. 7, shows a separate section of the ring in Fig-.5. Fig. 8, represents one of the springs, enlarged. Figs. 3 to 6,inclusive, are drawn on a scale of twice the size of Figs. 1 and 2.

As before stated, the improvements are in the pulley over which the band or strap passes, that raises the drop and upper die, and its object is to keep the band free from contact with this pulley when not engaged in raising the drop, as the pulley is supposed to be run continuously in one direction, by a belt from the driving shaft of the works, when the press is in use. The friction between the band and pulley, when the former is lying loosely on the pulley, results in a loss of power and a wearing of the band, and when the band is released to let the drop fall, after having raised it, and the band is passing in an opposite direction to that of the surface of the pulley, the friction, if the band is allowed to rest on the pulley, retards to a considerable Serial No. 476,102. (No model.)

degree, the downward motion of the drop, and lessens the effect intended to be produced by Vthe momentum the weight acquires in falling.

VIn Fig; l, A, is the anvil or block that holds the lower die; C, one of the standards that are attached Vto it, to guide th'e drop B,'that carries the upper die. J, is the lifting band y or strap which passes over the pulley R, and

has one end made fast to the drop B, and is pieced out at the other end by a rope or cord that can easily be grasped by the hand. The press pulley R, is made fast on acounter shaft D, placed in bearings over the press, and is driven by a belt N, not shown on the pulley P. (See Fig. 2.) The pulley R, is shown in section in Fig. 3. It consists of two 'halves R, R', cast from the same pattern, and

finished upl alike; but placed on the shaft in opposite directions, so as to bring their inner faces toward each otherfand leave a narrow,

open space between the edges of their rims,

at o. In this position, the two halves are made fast to the counter shaft D, by means of set screws or keys. Byleaving 0E the hubs on the inner sides of the two halves R, R', a space is left to receive a hub h, surrounded by a circular ange d, the hub'b, being left Ventirely free to turn on the shaft D. A deep annular groove or chamber c, Fig. 3, is made in the periphery of the liange d, to receive the sections g, of a ring, Figs. 5, 6, 7, which are fitted to slide freely in the groove c; but are held from coming out, by pinsc', t, which pass through the sides of the groove c and slots s, s, in the sections g, the slots being lengthened for the purpose of allowing the sections to slide in a direction to and from the center of the pulley. A recess a, is made, by boring the body of the flange d., under the middle of each section g, to receiveopen, spiral springs f, f, for the purpose of pressing the sections outward from the shaft, and shallow recesses c, fu, are made in-.the inside of each section g, to receive the outer end of each spring. The sections g, g, are most easily and correctly made,by casting them whole in a ring, turning its surface o all over, and then cutting it into sections, preferably six in number, as shown in dotted lines fr, r, in Fig. 5. These sections g, g, are so placed in the groove c, as to project a little distance out beyond the surface of the ypulley R, pressed by their springs f, placed under them. The pressure of the springs f, outward, is made just suflieient to hold the sections g, out to their extreme limit, when the weight of the band J, is on them, and thus hold the band elear of the pulley face, as in Fig. 3, that when it is desired to have the revolving pulley R, raise the drop B,a moderate pull of the hand on the rope end of the band J, will cause it to press the sections in, and let the band bear on the face of the pulley R, which will draw on the band and raise the drop to the rel quired height, when by relieving the rope of the pressure of the hand, the strain on the seetions g, will be removed, and they will at once raise the band from the face of the pulley and allow the drop to fall, with no other friction on the band than that made in turning the loose fianged hub Z), on the shaft, (Fig. 3.) An oil hole n, is made through one of the sections g, and of the spring recesses a., in the iiange d, through to the hole in the center of the hub h, to oil the bearing of the huh on the shaft. The length of the slots s, s, in the sections g, is so limited at their inner1w ends, as to bring up against the pins 1T, i, in them, when the sections are far enough out, and prevent the shoulders of the sections from touching the inner side of the pulley R, (see Fig. 3, at c) to prevent the sections or the flange d, from coming in contact with the pulley at any time.

Having thus described my improvements, I claim as 1nyinvention l. A pulley for use in drop presses, for the purpose of raising theV drop, said pulley consisting of two independent, substantially similar parts fast on a shaft, a flanged hub inclosed between said parts and adapted to run loosely on the shaft, and a ring formed of independent sections pressed outwardly from the center of the pulley, substantially as described.

2. The combination of a pulley having a circular channel in its periphery, a loose hub inclosed in said pulley, and having an annular groove made in its periphery, and a series of ring sections held in said annular groove, free from contact with said pulley at all times, with means for pressing those sections outward from the center of the pulley, substantially as described.

8. The combination of a pulley fast on a shaft, with a loose hub, a ring formed in sections, and means to press them outwardly, substantially as described.

FRANK MOSSBERG.

Witnesses:

BENJ. ARNOLD,

B. READ. 

